Not only is the installed capacity of the fan rising rapidly, but the power of the newly installed fan is also increasing. In 2005, the newly installed MW-class wind turbines (≥1MW) in China's wind farms accounted for only 21.5% of the newly installed capacity in the same year, and most of them were produced by foreign wind turbine companies. Domestic enterprises rarely have MW-class wind turbines. Production capacity. With the increase in the production capacity of domestic enterprises' megawatt wind turbines, the installed capacity of MW-class wind turbines in 2007 has accounted for 51% of the newly added market. In 2009 this proportion rose to 86.8%. The megawatt wind turbine has become the mainstream product in China's wind power market. Therefore, China's wind turbine manufacturing technology has played an important role in the stagnation of the initial stage and later achieved leap-forward development.
The main mode of China's wind turbine technology transfer, China's current wind turbine manufacturing technology mainly includes foreign direct investment (FDI), foreign companies providing technology, purchasing patent licenses, joint research and development and independent research and development. In addition to completely independent research and development, each of the other technical sources actually corresponds to a way of technology transfer. By summarizing the above technology transfer channels, it can be seen that the current technology supply of domestic wind turbine manufacturing technology is mainly foreign wind turbine manufacturers and foreign wind power design companies. The recipients of technology transfer, according to their ownership structure, can be divided into three categories: foreign-owned enterprises, Sino-foreign joint ventures and Chinese-funded enterprises.
Hot Melt Adhesive For Pearl Cotton
1. Pearl cotton is divided into porous type and ordinary type. For the porous type, it is necessary to pay attention to the fact that there can be no drawing during the viscose process, so it is necessary to choose the pearl cotton hot melt adhesive particles that are not drawn.
2. Pearl cotton is divided into white and colored. Generally, white pearl cotton is common, and colored pearl cotton requires transparent or consistent color hot melt adhesive particles for the color of hot melt adhesive.
3. Pearl cotton is divided into large and small pieces. The bonding process of large pieces of EPE takes a long time, and it is necessary to choose hot melt adhesive particles with a slower curing speed. The bonding process of small pieces of pearl cotton will be faster, and it is necessary to choose hot melt adhesive particles with fast curing speed.
4. There are different density in pearl cotton foam. The pearl cotton with a relatively high surface density needs to choose a more viscous pearl cotton rubber particle, because the pearl cotton with a high surface density is relatively less sticky.
5. The pearl cotton is bonded with other materials, such as honeycomb cardboard. At this time, it is necessary to consider whether it can stick to the two materials of pearl cotton and cardboard, and select the appropriate hot-melt glue particles according to the actual requirements.
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